Use OpenAI's GPT3 model to generate pull request descriptions.

pull-request-summary

#!/usr/bin/env bash
#
# Print a summary of the current pull request's commits.
#
# Requires an OPENAI_API_KEY env var to authenticate requests - see:
# https://beta.openai.com/docs/api-reference/authentication

# Commit selection variables.
TARGET_BRANCH=master

# OpenAI tuning variables (can be overridden by passing as env vars).
TEMPERATURE=${TEMPERATURE:-1}
MAX_TOKENS=${MAX_TOKENS:-512}
MODEL=${MODEL:-"text-davinci-002"}
INTRO=${INTRO:-"Write a summary of the commits in this pull request"}

# This command uses:
# - JQ to build the JSON payload (to handle escaping) 
# - httpie to post it to the OpenAI REST API to generate the completion
# - JQ (again) to extract the completion text out of the response
# - sed to strip blank lines
jq -n \
    --arg model "$MODEL" \
    --argjson temp $TEMPERATURE \
    --argjson tokens $MAX_TOKENS \
    --arg prompt "$(
        echo "$INTRO"; 
        git log origin/$TARGET_BRANCH.. --format='%B';
)" '{model: $model, temperature: $temp, max_tokens: $tokens, prompt: $prompt}' \
| http https://api.openai.com/v1/completions Authorization:"Bearer $OPENAI_API_KEY"  \
| jq -r '.choices[0].text' | sed '/./,$!d'